some components have outdated manual copy code, we need to clean these up with the new audio_stream_copy function.

Current spotted ones are:

• Crossover This works because the definition of audio_stream_copy does not include updating the buffer r/w
• IGO NR module not entirely necessary, just would allow a bypass of the whole interleave/deinterleave logic

I will need to see if there are any others but a quick search for "passthrough" yielded the above results.